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Operations and Summary of Significant Accounting Policies - Impact of ASU 2016-13 (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Assets          
Loans held for investment $ 24,519,195   $ 24,736,642    
Allowance for credit losses on loans (240,958) $ (195,047) (195,047) $ (208,573) $ (191,522)
Loans held for investment, net 24,205,424 24,451,215 24,451,215    
Net deferred tax asset   21,064      
Liabilities:          
Allowance for credit losses on off-balance sheet exposures 10,174 8,640 8,640 9,795 11,434
Equity:          
Retained earnings 1,668,329 1,694,608 1,694,608    
Cumulative Effect, Period Of Adoption, Adjusted Balance          
Assets          
Allowance for credit losses on loans   (203,632)      
Loans held for investment, net   24,442,630      
Net deferred tax asset   23,058      
Liabilities:          
Allowance for credit losses on off-balance sheet exposures   9,203      
Equity:          
Retained earnings   1,687,454      
Cumulative Effect, Period Of Adoption, Adjustment          
Assets          
Allowance for credit losses on loans   (8,585) (8,585)    
Loans held for investment, net   (8,585)      
Net deferred tax asset   1,994      
Liabilities:          
Allowance for credit losses on off-balance sheet exposures   563      
Equity:          
Retained earnings   (7,154)      
Commercial          
Assets          
Loans held for investment 9,402,250 10,230,828 9,133,444    
Allowance for credit losses on loans (91,020)   (102,254) (105,098) (96,814)
Commercial | Cumulative Effect, Period Of Adoption, Adjusted Balance          
Assets          
Loans held for investment   9,133,444      
Commercial | Cumulative Effect, Period Of Adoption, Adjustment          
Assets          
Loans held for investment   (1,097,384)      
Allowance for credit losses on loans     15,740    
Energy          
Assets          
Loans held for investment 1,331,489 1,425,309    
Allowance for credit losses on loans (113,921)   (60,253) (47,269) (34,882)
Energy | Cumulative Effect, Period Of Adoption, Adjusted Balance          
Assets          
Loans held for investment   1,425,309      
Energy | Cumulative Effect, Period Of Adoption, Adjustment          
Assets          
Loans held for investment   1,425,309      
Allowance for credit losses on loans     (24,154)    
Mortgage finance          
Assets          
Loans held for investment 7,588,803 8,169,849 8,169,849    
Allowance for credit losses on loans (4,331)   (2,265) (1,300) 0
Mortgage finance | Cumulative Effect, Period Of Adoption, Adjusted Balance          
Assets          
Loans held for investment   8,169,849      
Mortgage finance | Cumulative Effect, Period Of Adoption, Adjustment          
Assets          
Loans held for investment   0      
Allowance for credit losses on loans     (2,031)    
Construction          
Assets          
Loans held for investment   2,563,339      
Construction | Cumulative Effect, Period Of Adoption, Adjusted Balance          
Assets          
Loans held for investment        
Construction | Cumulative Effect, Period Of Adoption, Adjustment          
Assets          
Loans held for investment   (2,563,339)      
Real Estate          
Assets          
Loans held for investment 6,196,653 3,444,701 6,008,040    
Allowance for credit losses on loans $ (31,686)   (30,275) $ (54,906) $ (52,595)
Real Estate | Cumulative Effect, Period Of Adoption, Adjusted Balance          
Assets          
Loans held for investment   6,008,040      
Real Estate | Cumulative Effect, Period Of Adoption, Adjustment          
Assets          
Loans held for investment   2,563,339      
Allowance for credit losses on loans     $ 1,860    
Consumer          
Assets          
Loans held for investment   71,463      
Consumer | Cumulative Effect, Period Of Adoption, Adjusted Balance          
Assets          
Loans held for investment        
Consumer | Cumulative Effect, Period Of Adoption, Adjustment          
Assets          
Loans held for investment   (71,463)      
Equipment leases          
Assets          
Loans held for investment   256,462      
Equipment leases | Cumulative Effect, Period Of Adoption, Adjusted Balance          
Assets          
Loans held for investment        
Equipment leases | Cumulative Effect, Period Of Adoption, Adjustment          
Assets          
Loans held for investment   $ (256,462)